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   <subfield code="a">Giảm khí radon trong hệ che chắn để tăng giới hạn phát hiện cuả phổ kế gamma :</subfield>
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   <subfield code="b">Luận văn Thạc sĩ Vật lý chuyên ngành Vật lý Kỹ thuật</subfield>
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   <subfield code="a">Đề tài khảo sát các chuỗi phngs xạ tự nhiên, khảo sát các chuỗi và đồng vị phóng xạ có trông phông nền hệ phổ kế HPGe tại Bm VLHN. Trình bày các nguyên tắc ghi nhận bức xạ gamma, các đặc trưng của hệ phổ kế gamma phông thấp, các phương pháp giảm phông do póng xạ tự nhiên và do bức xạ vũ trụ.</subfield>
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